We present the first experimental optical trapping of ytterbium-doped sodium yttrium fluoride (Yb:NaYF4) hexagonal microdisks with a dual-beam dipole trap. These high-aspect-ratio hexagonal microdisks exhibit reduced photon recoil heating due to light scattering while allowing for 10s of kHz mechanical frequencies. These features make them good candidates as force sensors for the Levitated Sensor Detector (LSD) project, which detects high-frequency gravitational waves above the region previously probed by LIGO. We discuss motional dynamics of these microdisks by showing their motional spectra in comparison with analytical and numerical models and the recent progress of 1-meter LSD prototype that is under development at Northwestern University.
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